I like to trust this site in specific for helping me with magic, but obviously not everything online is true. So I want to know, how can I tell if a spell is real or not? I would prefer not to make a fool of myself by trying to use a fake spell

If it's telling you you can fly or become some creature, you can be certain the spell is fake. If it's just a simple chant without any intent, then don't expect that to work just by saying aloud intent less words.
Hope you have fun and learn what you're looking for! :)

I still have this problem a bit, but here are some tips
-Objective: if the objective of the spell is something like "turning into a werewolf!" or "flying", it's fake, may seem obvious but it's always good to remember that
-Rating: usually spells rated with more stars are more likely to be real, at least I only rate them highly when they work well
-The right ingredients: after a while you start to get familiar with the meaning of different flowers, stones, candles and you'll be able to tell if someone just randomly chose an ingredient that has nothing to do with what the spell should acomplish
-Chanting and meditating: you can't go wrong with simple chants for simple objectives, they may not be too powerful but they'll be helpfull enough
-Profile: check out the profile of whoever posted the spell,it's possible their bio has absurd claims ("i'm a vampire" "i learned how to fly") it's fake